Lockbook

Lockbook is an application for creating and managing notes that implements end-to-end encryption. The application synchronizes content between devices while maintaining data privacy. Users produce text, store documents, and create drawings within a protected workspace.

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• End-to-end encryption. Lockbook applies cryptographic algorithms before data transmission. Each note is encrypted on the local device with locally generated keys. The synchronization server receives and stores only encrypted data. This process ensures that neither infrastructure operators nor developers access the content.
• Cross-platform synchronization. The application maintains file consistency across different operating systems. Native desktop and mobile implementations ensure functionality in each environment. Changes made on one device are automatically propagated to others registered on the account.
• Markdown format. The editor incorporates Markdown syntax for text formatting. Users apply structural and stylistic elements using special characters. Real-time preview displays the formatted result during writing. This feature provides a structured method for document composition.
• Drawing tools. A basic set of instruments allows for creating sketches and handwritten annotations. Functions include freehand strokes, simple geometric shapes, and color selection. Drawings are integrated into the file system as additional elements alongside text notes.
• Hierarchical organization. The file system uses folders and subfolders for content classification. Users establish directory structures through drag-and-drop operations. The interface presents a tree view showing the complete document hierarchy.
• Controlled sharing. Permission mechanisms regulate access to specific notes. The owner of a document defines authorization levels for other users. Options include viewing and editing, with instant revocation of granted access.
• Offline mode. All core functions operate without requiring network connectivity. The application stores a complete local copy of the workspace. Synchronization reactivates automatically upon detecting internet availability.
• Command-line interface. A CLI utility provides control via terminal and scripts. This tool integrates with Unix-based workflows and task scheduling. Users execute complex operations through parameters and output redirection.
• Developer library. A set of APIs in the Rust language allows for programmatic extension of functionalities. The library facilitates task automation and integration with external applications. Technical documentation details the available methods and their parameters.
• Subscription system. A commercial model based on a monthly fee grants storage capacity. Users acquire additional space through a recurring payment. The service does not implement advertising or monetization of personal data.
• Full-text search. An indexing engine examines the content of all stored notes. The query returns results including terms within the encrypted text. The search operation processes information locally without transmitting criteria to the server.
• Version history. The system records incremental changes in each modified document. Users review previous states and restore accidentally deleted content. This chronological log maintains a backup of all edits made.

Development of Lockbook began in 2019. The creators designed the application as an alternative to note services that analyze user content. The team is composed of engineers specialized in distributed systems and applied cryptography. The technical implementation primarily uses the Rust programming language for core components. The graphical interfaces employ native frameworks corresponding to each target platform.

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